I am very sorry for your loss and the pain you are experiencing. I want to welcome you to the bb forum and congratulate you on having the courage to write what would have undoubtedly been a difficult post.
I too have lost a family member through suicide, so I can relate. I liken the effect to an explosion that leaves one disoriented, confused and shattered. Please don't under estimate the significant impact and the myriad of ways your sister's death could be effecting you or the time it will likely take you to heal.
I would like to encourage you to give yourself a little more time to consider leaving your job and changing locations. I say this for three reasons.
First, after such a death of a loved one, it takes time to return to a place where one has the right frame of mind and capacity to make big decisions. Second, starting a new job takes a lot of energy and this is energy that you might need for healing. Third, changing jobs will add stress and pressure to your everyday life.
So, could you entertain the idea of taking a break from work but putting the decision to permanently leave on hold for a little while?
If so, you could consider taking some extended leave from your current job. With a little space and time to build up your strength and work with your counsellor, it's possible that you might see things differently down the track. Or you could work with your counsellor to prepare for the change and ensure that your health is safeguarded.
These are just my thoughts based on my experience. I appreciate that everyone is different and I know how tough it is for you.
Kind thoughts to you